Concrete-mixer



Patented Oct. 12, 1920.

ATTORNEY W. H. HUDSON.

CONCRETE MIXER.

APPLICATION FILED FEB. 12. 1920. 1,355,478.

UNITED STATES PATENT OFFKZE.

WILLIAM H. HUDSON, WYOMISSING HILLS, PENNSYLVMTIA, ASSIGNOR T0 ABRAHAM LINCOLN FRAME, TRADING AS GRAY IRON FOUNDRY COMPANY,

or READING, PENNSYLVANIA.

CONCRETE-MIXER Specification of Letters Patent.

Patented Oct. 12, 1920.

Application filed February 12, 1920. Serial No. 358,203.

T 0 all whom it may concern Be it known that I, WILLIAM H. HunsoN,

a citizen of the United States, residing at.

certain new and useful Improvements in.

Concrete-Mixers, of which the following is a specification.

This invention relates to concrete mixers, the object thereof being to provide a sturdy, simple, compact concrete mixer of small dimensions but having a large mixing capacity and which is speedy in its operation and which also is substantially fool-proof in its mechanism.

A further object of the invention is the provision of an improved concrete mlxer in which the mixing blades are so constructed that the aggregates are rapidly carried from the charging end of the drum to a point where the materials are thoroughly and quickly mixed by the blades with a rolling grindin motion as the drum revolves, and in whic the blades are so formed that the concrete is lifted or carried after mixing to a point aboveand directly over the center of the discharge chute and deposited therein.

A further object of the invention is the provision of a concrete mixer so constructed that the blade and the head form a steep sloping deep pocket effective to materially hasten the discharge of the material.

A further object of the invention is the provision of a concretemixer having improved mixing blades so constructed and located that a perfect mixture of the material is obtained in the shortest possible time. I

In the drawingsaccompanying and forming a part of this specification, Figure'l 1s a perspective view of this improved concrete mixer with a part of the drum broken away to showthe interior thereof; Fig. 2

is also a perspective view of the mixer from a different point; Fig. 3 is a longitudinal sectional view of the rotary drum with one of the mixing blades in position and a portion of the discharge chute illustrated in dotted lines; Fig. 4 is a cross sectional view taken on line 4-4 of Fig. 3 but illustrating the four blades in position; and Fig. 5 is a detail perspective view of a portion of the inner side of the drum with one of the mixing blades in position.

Similar characters of reference indicate corresponding parts in the several figures of the drawings.

This improved mixer comprises a suitable supporting medium such, for instance, as a carriage comprising a skeleton platform 2, a rear axle and a pair of rear wheels 3, and a swiveled front axle and pair of wheels 4 provided with suitable means as 5 for drawing the mixer to the place where it is to be used. Mounted on this platform is a suitable motor as, for instance, a gas engine 6 for driving'the drum. A rotary drum 7 is suitably supported onthe platform by flanged rollers 8 having long bearings which permit rotation of the drum and also prevent endwise movement thereof since the flanges of'the rolls 8' overlap the projecting flanges or rings 8" of-the conical heads hereinafter described.

The drum 'body is preferably made of sheet steel and secured to the pair of cast iron conical heads by suitable bolts 28. This drum is provided with an exteriorly located sprocket ring 9 which may be made in sections so that it may be readily replaced for the reception of a sprocket chain 10, which also passes around a sprocket wheel on a transversely extending shaft 11. Upon this shaft ll-is fixed a pulley wheel 12 carryinn a bolt 13 running to a small pulley wheel 14 secured 'to the fi-y wheel of the motor, as for instance, a gasolene engine. Pivotally secured to an upright 15 on the carriage is a lever 16 carrying an idler pulley or belt tightener 17, and when this idler is shifted into position near the engine pulley,the belt has more contact with the engine pulley and consequently the drum will be rotated. When this idler is raised the belt will of course slip over the pulley so that the drum is not then rotated. The rotary drum, while small in size,- is provided with a pair of conical ends or heads 18, each provided with a centrally located opening, one of which as 19, forms the inlet to the drum and the other, as 20, forms the outlet. By providing these conical heads, the capacity of the drum, although small in size, is materially enlarged. I

These conical heads are identical and are provided on the interior of the drum around the openings forming the inlet and discharge with integral deflecting rings 19' and 20 respectively projecting toward the axial center of the drum which prevent the spilling of the aggregates and keep all .-of the drip inside of the .drum and are also formed at the exterior of the inlet and outlet with outside integral drip rings 19" and 20" respectively which project away from the axial center of the' drum. The inlet end of the drum is provided with" a steep sloping feed chute 22 while the discharge end of the drum is provided with a discharge chute 23 adapted to project into the drum and this chute is swung from a shaft 24 mounted onthe discharge end of the drum, and is link connected as at 25 with a hand wheel '26 by means of which the chute may be manipulated. Located within the drum are four mixing blades 27, these blades being so constructed and located that the aggregates arerapidly carried from the inlet end of the drum to the point A (see Fig. 3) of the blades, where the materials are thoroughly and quickly mixed with a rolling and gr nding'motion as the drum revolves. Each of theseblades is troughed as at A, which serves as a pocket to lift or carry the concrete after mixing to a point above and over the discharge chute, at which point a portion of the blade is offset or sloped back as-at B so as to have for all practical purposes substantially. a beveled position with respect to the rest of the blade, so that the material is carried directly over the center of the discharge chute and deposited in the chute when the latteris inside the drum in its discharge position: In other words, if the mixing blade were so located that it followed a line drawn on the center of the cylinder to the periphery it would mean that when mixing the aggregates the blades would drop the material before they had attained a position over.

the center of the discharge chute. To prevent this is the reason why the blades are beveled upward from this line, so that they retain the materials for a longer period, thus carrying the materials to the desired point, which is directly centered over the delivering or discharge chute. The mixing blades at the inlet end of the drum run along the cone of the head and together with thiscone-shaped head form a steep sloping deep pocket as at C, which materially hastens the carriage of the materialto the mixing point and the consequent discharge thereof. V

The mixin blades run diagonally across the drum and on account of their peculiar design give a perfect mixture in the shortest possible time.

Each mixing blade is bolted to the drum shell or cylindrical face of the drum, that is to say, the wings of each blade are secured to the cylindrical shell of the drum by suitable knees 29, each riveted to the wing or blade and inturnrbolted to the drum shell while the ends of each blade are unattached to the conicalheads of the drum. The ends of the four blades adjacent to the inlet end project along the face of the cone head and fit tightly thereto while the discharge ends of the blades terminate in proximity to the outlet end of the drum.

It will be observed that each of these blades in a sense has something of the shape of a letter Z, but is so constructed that they are trough-shaped adjacent to the point A, thereby to form a pocket to lift or carry the concrete after it is mixed to a oint above and over the discharge chute an that the discharge end of each blade is undercut or beveled ,back as at B, so that the material will be carried directly over the center of the discharge chute, so that the four, blades in operation during the rotation of the drum will not only efliciently and rapidly convey the material from the inlet 35 to the discharge end of the drum, but during the conveyance thereof will efliciently and effectively mix the material in a very rapid manner.

.I claim as my invention:

'1. A concretemixer comprising supporting means, a rotary drum supported thereon and comprising a cylindrical shell and a pair-of conical ends having'centrally located inlet and discharge openings, and a plurality of diagonally located mixing blades positioned within the drum and extending substantially the entire length thereof, each having a-trough shaped portion and a portion sloped with respect to the main 100 portion, the sloped portion being adjacent to the discharge end of the drum and unattached thereto.

2. concrete mixer comprising support ing means, a rotary drum supported thereon, means for rotating it, said drum having a pair of conical ends provided with centrally located inlet and discharge openings, and. a pluralityfof diagonally located mixing blades positionedwithin the drum, each having a trough-shaped portion and a sloped portion, the latter adjacent to the discharge end of the drum, each of said blades also having a portion projecting along and in juxtaposition to the coneshaped head at the inlet end of the drum.

3. A- concrete mixer comprising supporting means, a rotary drum supported thereon, means for rotating it, said drum having a pair of conical ends provided with centrally located inlet and discharge openings, a plurality of diagonally located mixing blades positioned within the drum, ea h having a trough-shaped portion and a sloped portion, the latter adjacent to the discharge end of the drum, each of said blades also having a portion projecting along and in juxtaposition to the coneshaped head at the inlet end of the drum,

a feed chute secured to the drum at the intrough-shaped portions being attached to said shell and said sloped portions being unattached thereto.

5. A rotary drum for a concrete mixer having a cylindrical shell and a pair of sloping heads provided respectively with a centrally located inlet and discharge opening, and a plurality of diagonally located offset mixing blades secured within said drum and extending substantially the entire length thereof, each of said blades having one end thereof fitting tightly againstand conforming to the shape of one of said conical heads, and each thereof having'a troughed portion abutting substantially the central portion of said shell.

6. A rotary drum for a concrete mixing machine comprising a cylindrical shell and a pair of conical ends, a plurality of mixing blades extending from one conical end to the other, each blade having a deep trough-shaped pocket abutting the inner surface of said shell and one end located in juxtaposition to one of said conical ends,

' said blades being attached only to said cylindrical shell, and having substantially the same length as said drum.

'7. A rotary drum for a concrete mixing machine comprising a cylindrical body and a pair of conical heads havin a centrally located opening, each of said he around its opening an inside deflecting ring projecting toward the axial center of the drum, and an outside drip rin away from the axial center oft edrum.

8 A rotary drum for a concrete mixing machine comprising a cylindrical body and a pair of conical heads having a centrally located opening, each of said heads having around its opening an inside deflecting ring, an outside drip ring, a feed chute secured to the drum adjacent to the inlet end thereof, a shiftable discharge chute secured to the drum at the outlet end thereof, and a series of mixing blades secured only to the body of the drum and each having a ,substantially Z-shaped formation.

9. A rotary drum for a concrete mixing machine comprising a cylindrical body and a pair of conical heads havingra centrally located opening, a feed chute secured to the drum adjacent to the inlet end thereof, a

shiftable discharge chute secured to the drum at the outlet end thereof, and a series ads having projecting of mixing blades secured only to the body of the drum and each having a substantially Z-shaped formation and each provided with a. trough-shaped portion terminating in a sloped portion adjacent to the discharge end and in a projecting end conforming to the inlet conical head.

10. A concrete mixer comprising a cardischarge chute secured-to the other conical head adjacent to the outlet, a series of mixing blades secured only to the body of the drum and each having a trough-shaped portion terminating in a sloped portion, the latter located adjacent to the discharge end of the drum and also having an end conforming to the inlet conical head thereby to form a steep sloping deep pocket adjacent to the inlet, a sprocket ring located exteriorly on the drum, a transverse shaft having a sprocket, a sprocket chain cooperating with the shaft and drum sprockets, a pulley wheel on said shaft, a motor on said carriage, and a belt for imparting power from said motor to said pulley wheel thereby to rotate the drum.

11. A concrete mixer comprising a carriage, arotary drum comprising a cylindrical body having a pair of conical heads bolted thereto, each of said heads having centrally located openings, a feed chute adapted to be connected to one conical head adjacent the inlet, a shiftable discharge chute adapted to be connected to the other conical head adjacent the outlet, a series of mixing blades extending diagonally substantially the entire length of said drum and each having a trough-shaped portion terminating in a portion sloped with respect to the main portion thereof, said sloped portion being located adjacent the discharge end of the drum, and each of said blades having an end projecting along the faceof the cone head and fitting tightly thereto adjacent the inlet end of the drum, thereby to form a deep sloping pocket, said blades being attached only to said cylindrical bod means for rotating said drum, and shifta 1e means for connecting or disconnecting said first mentioned means.

12. A concrete mixer comprising supporting means, a rotary drum supported thereon. and comprising a central cylindrical porcentrally located trough-shaped portion, a delivering portion havin a part thereof sloped, and a portion pro ecting along and in juxtaposition to the cone-shaped head at the inlet end of the drum thereby to form with said head a steep'sloping deep pocket.

13. A concrete mixer comprising support ing means, a rotary drum supported thereon,- means for rotating it, said drum comprising a central cylindrical portion and a pair of conical ends provided with centrally located inlet and discharge openings, and

having a portion projecting along and in 15 juxtaposition to the. cone-shaped head at the inlet head of the drum thereby to form with said head a stee sloping deep pocket.

Signed at Reading, enna., this ninth day of February, 1920.

WILLIAM H. HUDSON. 

